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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        // 和then的结果一样
        async function main(){
            // return 11;

            // return new Promise((resolve,reject)=>{
            //     reject("error");
            // })

            throw "err";
        }

        let result = main();
        console.log(result);
    </script>
</body>
</html>